Web-guide for rotary cutters



H. M. BARBER. WEB GUIDE FOR ROTARY CUTTERS.

APPLICATION FILED APR. 22.19I9.

1,394,961, Patented Oct. 25, 1921.

2 SHEETS-SHEET I.

H. M. BARBER. WEBGUIDE FOR ROTARY CUTTERS. APPLICATION FILED APR. 22. 1919.

Patented Oct. 25, 1921.

2 SHEETSSHEET 2- UNITED STATES PATENT OFFICE.

HOWARD M. BARBER, OF STONINGTON, CONNECTICUT, ASSIGNOR TO 0. B. COTTRELL 8c SONS COMPANY, OF NEW YORK, 11'. Y.. A CORPORATION OF DELAW'ARE.

"WEB-GUIDE FGR ROTARY CUTTEBS.

Application filed April 22,

To all whom it may concern Be it known that I, HOWARD M. BARBER, a citizen of the United States, and resident of Stonington, in the county of New Lon don and State of Connecticut, have invented a new and useful Improvement in lVeb- Guides for Rotary Cutters, of which the following is a specification.

In machines for cutting sheets from a traveling web, especially when designed for running at high speeds and for handling wide webs it has been found difficult to secure an even cut across the web because of the tendency of the web to develop a wavy action. It has also been difiicult to insure the positive guiding of the leading end of the web through the cutters to the main web guides.

My invention is directed to novel web guiding means carried by the rotary cutters for overcoming these difficulties and thus insuring the positive and accurate feeding of the web.

A practical embodiment of my invention is represented in the accompanying drawings in which,

Figure 1 represents a top plan view of that part of a machine for cutting sheets from a traveling web which includes my invention, the rotary cutters being illustrated in the position where the sheet is being severed from the traveling web and the web guides about to be engaged by their stationary cams.

Fig. 2 represents a transverse section taken in the plane of the line IL-II- of Fig. 1.

Fig. 8 represents a transverse section taken in the plane of the line III-III of Fig. 1.

Fig. 1 represents a transverse section taken in the plane of the line I V-IV of Fig. 1.

Fig. 5 represents a detail transverse section showing the cutters and web guides in positions slightly advanced from those illustrated from 1 to 4. inclusive.

Fig. 6 represents a similar section showing the cutters and web guides in positions slightly advanced from those illustrated in Fig. 5. v

The side frames of the machine are designated by l, 2, in which frames are mounted the shafts 3, 4 of the pair of rotary cutters 5, 6. These cutters are driven from any suitable source of power not shown, and they are provided at their ends with the usual intermeshing gears 7, 8, and 9, 10. These rotary Specification of Letters Ea/tent.

Patented Got. 25, 1821.

1919. Serial No. 291,93

cutters are provided with one or more, in the present instance two pairs of enacting knives 11, 12.

The pairs of coacting web guide: which are carried by the cutters for guioing the leading end of the traveling web are located to the rear of the pairs of coacting knives 11, 12 and each of these guides is arranged in one or two sections according to the widtl of the web for which the particular machine is designed. 1n the present instance, 1 have illustrated a machine having each web guide arranged in two sections operated inde =ndently from opposite sides of the machine. It is to be understood that there is a pair of web guides provided for each pair of knives on the rotary cutters.

These web guides are constructed, arranged and operated as follows A stationary double cam 13 is carried by posts 14, 15 projecting inwardly from the adjacent side frame, which cam has two cam surfaces 16, 17 meeting each other at a point between the rotary cutters adjacent to the cutting line.

The rock shafts 18, 19 of the web guides are mounted at their inner ends in the transverse disks 20, 21 forming integral parts of the rotary cutters. The outer ends of these shafts are mounted in the end disks 22, 23, also forming integral parts of the rotary cutters. These shafts are provided with forwardly projecting coacting pairs of guide fingers 24, 25, the free ends of which swing in arcs immediately back of the knives 11. 12.

The outer ends of the web guide shafts 18, 19 are provided with arms 26, 27 having studs or rollers 28, 29 arranged in position to be engaged by and travel along the cam surfaces 16, 17 respectively of the stationary double cam 18 as the cutters are rotated; to swing the fingers outwardly and keep their free ends in engagement with the leading end of the web as it passes from the cutters to the main guide 30, 31.

Spring pressed means, in the present instance, pins 32, 33 sliding in sockets in the ends of the rotary cutters, yieldingly hold the rock arms 26, 27 at the limits of their outward swinging movement. against the fixed stops 3 1, 85, carried by the end disks 22, 23 of the rotary cutters.

These spring means yieldingly hold the studs or rollers 28, 29 at the limits of their web outward movement and the web guide fingers 24c, 25 at the limits of their inward movement. The double cam 13 serves when engaged with the studs or rollers to move them inwardly and thereby swing the uide fingers outwardly more or less according t0 the shape of the cam surfaces 14, 15, after the free ends of the web guide fingers pass the cutting line of the rotary cutters.

It will be seen from the above description that in operation the free ends of the web guide fingers will engage the opposite sides of the traveling web just before the sheet is severed therefrom to guide the leading end of the web positively and accurately tothe main guide 30, 31, the free ends of the web guide fingers being swung outwardly beyond the peripheries of the rotary cutters after the cutting line is passed.

It will be understood that the web guide controlling means is the same at both sides of the machine where the web guides are divided into two sections, the operating means at one side of the machine operating to swing its sections of the pair of web guides at the same time as the means on the other side of the machine to control the web at this point.

It is evident that various changes may be resorted to, in the form, construction and arrangement of the several parts without departing from the spirit and scope of my invention, hence I do not wish to limit myself to the structure herein shown, but

What I claim is:

1. In a machine of the character described, a pair of rotary cutters having coacting knives and a pair of relatively movable coacting web guides carried by the cutters for controlling the leading end of the web, each web guide comprising alined sections.

2. In a machine of the character described, a pair of rotary cutters having coacting knives and a pair of relatively movable coacting web guides carried by the cutters for controlling the leading end of the web, each uide comprising two alined sections.

3. In a machine of the character described, a pair of rotary cutters having coacting knives, a pair of co-acting web guides carried by the cutters, each welgvuide comprising alined sections, and means for rocking said web guides to control the leading end of the web.

4. In a machine of the character described, a pair of rotary cutters having coacting knives, a pair of co-acting web guides carried by the cutters, each web guide comprising two alined sections, and means on both'sides of the machine for rocking said web guides to control the leading end of the web.

5. In a machine of the character described, a pair of rotary cutters having coacting knives, a pair of co-acting web guides carried by the cutters and having forwardly projecting fingers normally lOClilBClWlill'llIl the peripheries of the cutters and means for rocking said web guides to swing the fingers beyond the peripheries of the cutters for maintaining control of the leading end of the web beyond the cutting line.

6. In a machine of the character described, a pair of rotary cutters having coacting knives, a pair of co-acting web guides carried by the cutters, each web guide comprising alined sections having forwardly projecting fingers normally located within the peripheries of the cutters, and means for rocking said web guides to swing the fingers beyond the peripheries of the cutters for maintaining control of the leading end of the web beyond the cutting line. v

7. In a machine of the character described, a pair of rotary cutters having coacting knives, a pair of co-acting web guides carried by the cutters, each web guide comprising two alined sections having forwardly projecting fingers normally located within the peripheries of the cutters, and means on both sides of the machine for rocking said web guides to swing the fingers beyond the peripheries of the cutters for maintaining control of the leading end of the web be yond the cutting line.

8. In a machine of the character described, a pair of rotary cutters having coacting guides, a pair of co-acting web guides carried by the cutters, said web guides-having rock shafts mounted in the cutters provided with forwardly projecting fingers arranged to swing in arcs in proximity to the knives, and a stationary double faced cam, said -rock shafts also having crank arm studs or rollers arranged to engage said cam for rocking the guides to swing the fingers for controlling the leading end of the web beyond the cutting line. v r

9. In amachine of the character described, a pair of rotary cutters having coacting knives,-a pair of co-acting web guides carried by the cutters, each web guide comprising two alined sections having rock shafts mounted in the cutters provided with forwardly projecting fingers arranged to swing in arcs in proximity to the knives, and stationary double faced cams arranged at both sides of the machine, said shafts having crank arm studs or rollers arranged to engage said cams for rocking the guides to swing the fingers for controlling the leading end of the web beyond the cutting line.

In testimony, that I claim the foregoing as my invention, I have signed my name this fifteenth day of April, A. D. 1919.

HOWARD M. BARBER. 

